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Carrier 48NHT024 User Manual

Carrier 48NHT024
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HEATING
A
COOLING
48N
Packaged
Heating/Cooling
Units
Installation
Instructions
NOTE
TO
INSTALLER:
Leave
these
instructions,
the
User's
Manual,
and
Parts
Replacement
Guide
with
the
unit
after
installation.
A
WARNING
Improper
installation,
adjustment,
alteration,
service,
maintenance,
or
use
can
cause
carbon
monoxide
poison¬
ing,
explosion,
fire,
electric
shock,
or
other
occurrences
which
may
injure
you
or
damage
your
property.
Con¬
sult
a
qualified
installer,
service
agency,
or
the
gas
sup¬
plier
for
information
or
assistance.
The
qualified
agency
must
use
factory
authorized
kits
and
accessories
when
modifying
this
unit.
NOTE:
The
installation
of
this
unit
must
conform
to
the
guidelines
presented
in
these
unit
Installation
Instructions.
Read
and
become
familiar
with
this
publication
before
start¬
ing
the
installation.
INTRODUCTION
Model
48N
Packaged
Gas/Electric
Unit
is
fully
self-con¬
tained,
combination
gas
heating/electric
cooling
unit
designed
for
outdoor
installation.
Model
48N
may
be
installed
either
on
a
rooftop
or
ground-level
slab.
See
Fig.
1.
For
rooftop
downflow
applications,
an
accessory
roof¬
mounting
curb
must
be
used.
Model
48N
Unit
meets
the
California
maximum
oxides
of
nitrogen
(No
x
)
emission
regulations.
These
units
are
equipped
with
an
energy-saving,
automatic,
intermittent,
electric
spark
ignition
system
that
does
not
have
a
continuously
burning
pilot.
All
units
are
manufac¬
tured
with
natural
gas
controls.
These
units
are
designed
for
a
minimum
continuous
return
air
temperature
of
60
°F.
(dry
bulb)
or
an
intermittent
opera¬
tion
down
to
55°F.
(dry
bulb)
such
as
when
used
with
a
night
set
back
thermostat.
Model
48N
is
A.G.A.
and
C.G.A.
design-certified.
See
Tables
2
thru
7
for
the
heating
input
ratings.
These
units
are
factory-charged
with
R-22
refrigerant.
Installation
is
simple:
connect
gas
supply,
air
ducts,
high-
and
low-voltage
wiring,
condensate
drain,
and
install
a
field-
supplied
air
filter.
All
units
can
be
connected
into
existing
duct
systems
that
are
properly
sized
and
designed
to
handle
an
airflow
of
350
to
450
Cfm
per
each
12,000
Btuh
of
rated
cooling
capacity.
See
Tables
2
thru
7
for
cooling
and
heating
airflow
require¬
ments.
NOTE:
When
installing
any
accessory
item,
see
the
manu¬
facturer's
Installation
Instructions
packaged
with
the
ac¬
cessory.
The
Qualified
Agency
must
use
factory
authorized
kits
or
accessories
when
modifying
this
unit.
Fig.
1
—Model
48N
IMPORTANT—READ
BEFORE
INSTALLING
1.
This
installation
must
conform
with
all
applicable
local
and
national
codes.
2.
The
power
supply
(volts,
hertz,
and
phase)
must
corre¬
spond
to
that
specified
on
unit
rating
plate.
3.
The
electrical
supply
provided
by
the
utility
must
be
sufficient
to
handle
load
imposed
by
this
unit.
4.
Refer
to
the
48N
dimensional
drawing
for
locations
of
gas
inlet,
electrical
inlets,
condensate
drain,
duct
con¬
nections,
and
required
clearances
before
setting
unit
in
place.
Figs.
2
and
3.
5.
Locate
the
unit
where
the
vent
cap
will
be
a
minimum
of
4-ft
from
openable
windows
or
doors.
6.
This
installation
must
conform
with
local
building
codes
and
with
the
National
Fuel
Gas
Code
ANSI
Z223.1-1984
and
Addenda
Z223.la-1987
(In
Canada,
CAN/CGA
B149.1,
(2)-M86)
or
NFPA
54-1984
TIA-54-
84-1.
Refer
to
Provincial
and
local
plumbing
or
wastewater
codes
and
other
applicable
local
codes.
7.
For
outdoor
installation
on
wood
flooring
or
on
class
A,
B,
C
roof
covering
materials.
GENERAL
Model
48N
Packaged
Gas/Electric
Unit
has
been
designed
and
tested
in
accordance
with
ANSI
Z21.47-1987,
ARI
Standard
210-81,
and
ARI
Standard
270-84,
CAN/CGA-2.3-
M86,
CAN
1-2.17-M80,
CAN
1-2.21-M85,
CSA
C22.2
No.
0-
1982,
No.
3-1979
and
No.
119-M1985.
The
appliance
design
is
certified
by
the
American
Gas
Association
(A.G.A.)
and
Canadian
Gas
Association
(C.G.A.)
for
use
with
natural
or
LP
(propane)
gases
with
appropriate
controls
and
orifices.
Manufacturer
reserves
the
right
to
discontinue,
or
change
at
any
time,
specifications
or
designs
without
notice
and
without
incurring
obligations.
PC
101
Catalog
No.
564-816
Printed
in
U.S.A.
Form
48NT-9SI
Pg
1
9-88
Replaces:
48NT-8SI
Book
1
4
Tab
la
la

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Carrier 48NHT024 Specifications

General IconGeneral
BrandCarrier
Model48NHT024
CategoryChiller
LanguageEnglish

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